// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_CALLBACK_FORWARD_H_
#define BASE_CALLBACK_FORWARD_H_

namespace base {
namespace internal {

    // CopyMode is used to control the copyablity of a Callback.
    // MoveOnly indicates the Callback is not copyable but movable, and Copyable
    // indicates it is copyable and movable.
    enum class CopyMode {
        MoveOnly,
        Copyable,
    };

    enum class RepeatMode {
        Once,
        Repeating,
    };

} // namespace internal

template <typename Signature,
    internal::CopyMode copy_mode = internal::CopyMode::Copyable,
    internal::RepeatMode repeat_mode = internal::RepeatMode::Repeating>
class Callback;

// Syntactic sugar to make Callback<void()> easier to declare since it
// will be used in a lot of APIs with delayed execution.
using Closure = Callback<void()>;

template <typename Signature>
using OnceCallback = Callback<Signature,
    internal::CopyMode::MoveOnly,
    internal::RepeatMode::Once>;
template <typename Signature>
using RepeatingCallback = Callback<Signature,
    internal::CopyMode::Copyable,
    internal::RepeatMode::Repeating>;
using OnceClosure = OnceCallback<void()>;
using RepeatingClosure = RepeatingCallback<void()>;

} // namespace base

#endif // BASE_CALLBACK_FORWARD_H_
